Effect of the Al/clay ratio on the thiabendazol removal by aluminum pillared clays

M. EUGENIA ROCA JALIL; MIRIA BASCHINI ; ENRIQUE RODRÍGUEZ-CASTELLÓN; ANTONIA INFANTES-MOLINA; KARIM SAPAG

APPLIED CLAY SCIENCE

ELSEVIER SCIENCE BV

Lugar: Amsterdam; Año: 2013

0169-1317

In thiswork, four aluminumpillared clays (Al-PILC)with different Al/clay ratioswere synthesized and evaluated 25 for the removal of thiabendazole (TB) (a fungicide widely used in agricultural activities) from aqueous media. 26 The Al-PILC were thoroughly characterized by different techniques, such as X-ray diffraction (XRD), thermogra- 27 vimetric analysis (DTA-TG), adsorption?desorption of N2 at 77 K, NH3-temperature programmed desorption 28 (NH3-TPD) and transmission electron microscopy (TEM). The TB-adsorption studies were carried out in batch, 29 at room temperature, at pH = 6 (natural pH, without additional control) and with different concentrations of 30 TB (2?100 ppm). The measured TB adsorption capacities varied from 11.78 to 17.50 mg TB per gram of clay. 31 The TB?Al PILC complexes obtained after the adsorption process were studied by X-ray photoelectron spectros- 32 copy (XPS). The results suggested that the molecules of TB were adsorbed on the Al-PILC by two different phe- 33 nomena: by physisorption in their porous structure and by chemisorption on their pillars, showing a 34 concordance between the amounts of incorporated aluminumin the pillared clays and their fungicide adsorption 35 capacity.